RU2709581C1 - Vertical cylindrical tank for storage of liquids - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: vertical cylindrical tank for storage of liquids relates, mainly, to oil industry and can be used for storage of liquid oil products and liquefied gases. Tank wall consists of two layers, between which there is a gap, in which there are circular trusses consisting of inner and outer belts interconnected by links in form of triangular grid.

EFFECT: high strength and rigidity of the wall with simultaneous reduction of thickness of sheets of both layers of the double-layer wall; higher safety of tank operation.

5 cl, 3 dwg

Description

The invention relates to the field of construction, in particular, to steel tanks of large capacity for storing oils and petroleum products.

As the geometric dimensions of the tanks increase, the danger of catastrophic consequences increases when they are destroyed, or even if the wall is not tight. Therefore, it is necessary to increase the wall thickness of the tanks. Excessive increase in wall thickness causes difficulties in manufacturing and leads to an increase in metal consumption.

To prevent the destruction of such tanks, various structural solutions have been proposed. Known tank with a protective wall / 1 /. It consists of a main internal tank designed specifically for storing the product, and a protective external tank designed to hold the product in the event of an accident or a leak in the main tank. To increase strength, the main inner and protective tanks are equipped with stiffening rings or emergency ropes. The disadvantage of such a reservoir is that only the main internal reservoir perceives the entire operational load. There is no guarantee that in the event of an avalanche destruction of the main tank, the protective tank will withstand the force of water hammer. Therefore, it is required to increase the wall thickness of both the main and the protective reservoirs.

Known tank with a protective wall / 2 /. This tank consists of a main internal tank, including a wall, a bottom, a roof, and a protective wall with an additional bottom attached to it. Between the wall of the main reservoir and the protective wall in the lower part of the inter-wall space, a spatial connection device consisting of stiffening rings, radial and vertical struts is installed and attached to the walls. The disadvantage of this tank is that the spatial rigidity of the walls of the tank is provided only in the zone of the lower zone of the tank. In the middle and upper parts, the two walls work individually.

Known tank with a two-layer wall / 3 /. Both layers of the wall perceive the operational load at the same time. The advantage of this tank is that the wall thickness of each layer is less than that of a conventional single-layer wall. This makes it possible to better roll the wall in the manufacture of large tanks. Designs of tanks with a two-layer wall with a capacity of 50 thousand cubic meters and 100 thousand cubic meters were developed. The disadvantage of this tank is the lack of spatial rigidity between the walls.

The proposed reservoir is devoid of these disadvantages due to the fact that the two walls are structurally connected along the entire height using a trellised truss with parallel rings of ring shape and a triangular lattice inside the belts. Depending on the size of the gap between the two walls, the truss grill can be installed horizontally or at an angle to the vertical. The angle of inclination is determined by calculation depending on the size of the tank and the size of the gap between the walls. Due to this, the operational load on the tank is simultaneously taken by both walls and the truss. This can significantly reduce the thickness of the outer and inner walls. The layer between the walls can be filled with insulating material. Then the tank turns into a thermally insulated one, in which it is possible to store easily hardened liquids and liquefied gas.

The invention is illustrated by drawings.

FIG. 1. General view of the tank with a section of part of the walls.

FIG. 2. A fragment of the wall of the tank with farms in the context.

FIG. 3. The location of the truss belt on the annular seam.

The design of the proposed tank includes a bottom 1, a roof 2, and a two-layer wall 3 consisting of an outer layer 4, an inner layer 5. Between the inner and outer layers there is a gap in which an annular truss 6 consisting of an outer belt 7, an inner belt 8 is located, and connections 9. The number of ring trusses is determined by calculation depending on the height and radius of the tank. The outer belts 7 of the trusses are installed on the circumferential seams 10 between the belts of the outer wall layer, the inner belts 8, respectively, on the circumferential seams 11 between the belts of the inner wall layer. This makes it possible to weld the annular seams of the walls by unilateral welding on the washer rings. Belts 7 and 8 can be made of sheet or corner. Connections can be made from a corner, a channel or from pipes.

The wall of the tank, therefore, and the tank as a whole, operates as follows. The hydrostatic pressure of the fluid, the snow and wind load, the dead weight of the structure are simultaneously taken together by the outer layer 4, the inner layer 5 and the trusses 6. This can significantly reduce the thickness of both the inner and outer layers. The proposed reservoir at the same time performs the functions of a reservoir with a protective wall, since in case of a violation of the tightness of the inner layer, the outer layer prevents the liquid from escaping to the outside. In the case of filling the inter-wall layer with insulating material, the tank works as insulated, where it is possible to store easily hardened liquids and liquefied gas.

Sources of information

1. GOST 31385 - 2016. Vertical cylindrical steel tanks for oil and oil products. General specifications. M. Standartinform, 2016.

2. RF patent No. 2507359 (class Е04Н 7/04, priority 2011-11-01). The tank with a protective wall.

3. S.I. Verevkin, E.A. Zeliger. The study of the deformation of a two-layer wall of a vertical cylindrical tank with a capacity of 15 thousand m3. "Transport and storage of petroleum products and hydrocarbons." Scientific and technical collection No. 9, 1975.

Claims (5)

1. A vertical cylindrical tank for storing liquids, including a two-layer wall, a bottom and a stationary roof, characterized in that a gap is formed in the inter-space, in which ring-shaped trusses are installed, consisting of two ring-shaped belts connected together by a triangular lattice and welded to the walls of the tank. 2. A vertical cylindrical tank for storing liquids according to claim 1, characterized in that the ring-shaped truss belts are installed on the circumferential seams of the inner and outer layers of the tank wall with the possibility of performing one-sided welding of the circular seams of the walls. 3. A vertical cylindrical tank for storing liquids according to claim 1, characterized in that the trusses are located in a horizontal plane. 4. A vertical cylindrical tank for storing liquids according to claim 1, characterized in that the annular truss belts are made of a sheet profile. 5. A vertical cylindrical tank for storing liquids according to claim 1, characterized in that the annular belts of the truss are made of rolled steel.

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